Problem with vm.pmap.shpgperproc and vm.pmap.pv_entry_max

So, I never had problem with this server, but recently it starts to giv me the following messages *every* minute : Jul 3 10:04:00 squid kernel: Approaching the limit on PV entries, consider increasing either the vm.pmap.shpgperproc or the vm.pmap.pv_entry_max tunable. Jul 3 10:05:00 squid kernel

Reading in real time from a file without pipes

Hello everyone, I wonder if is possible to read data from a certain file without using a pipe. Let me explain: I have a process already writing messages to a logfile. I want to read all written data (without neither stop nor interfere normal log process) from another process in real time. How